<http://ns.inria.fr/covid19/PMC7361117#body_text>	<http://purl.org/dc/terms/subject>	"Trade unions" .
<http://ns.inria.fr/covid19/PMC7361117#body_text>	<http://purl.org/dc/terms/subject>	"Regions of the Western United States" .
<http://ns.inria.fr/covid19/PMC7361117#body_text>	<http://purl.org/dc/terms/subject>	"Regions of the Southern United States" .